the target capital structure is for QM industries is 38 percent common stock, 5 percent preferred stock, and 57 percent debt. If the cost of common equity for the firm is 18.6 percent, the cost of preferred stock is 10.1 percent, the before-tax cost of debt is 8.1 percent, and the firm's tax rate is 35 percent, what is QM's weighted average cost of capital?